Younger voters overwhelming want the Democrats to keep the White House, but they are backing insurgent Sen. Bernie Sanders over establishment-favorite Hillary Clinton by six points, 41 percent to 35 percent, according to a comprehensive poll from Harvard University's Institute for Politics.

But, found the poll, more Republican youth voters believe that Carson is more qualified to be president than Trump, by a 43 percent to 38 percent margin. And in the good news category for both, most said that integrity, level-headedness and authenticity were the attributes most valued in presidential candidates, not government or political experience.

The surge of Sanders was surprising. In Harvard's spring 2015 poll, just 1 percent backed Sanders. The shift cost support for former Maryland Gov. Martin O'Malley. His support was less than 1 percent. It's worse for Clinton. Her support has dropped 12 points since the IOP spring poll, from 47 percent to 35 percent.